According to the elasTc rebound hypothesis, most earthquakes are produced by the rapid release of energy stored in rock that has been subjected to great forces. When the strength of the rock is exceeded, it suddenly breaks, releasing some of its stored energy as seismic waves. AFershocks and Â±oreshocks Even a great earthquake like the 1906 San Francisco earthquake usually does not release all the elasTc energy stored in the rock along a fault.
Type rating. A type rating is a regulating agency's certification of an airplane pilot to fly a certain aircraft type that requires additional training beyond the scope of the initial license and aircraft class training. What aircraft require a type rating is decided by the local aviation authority.
Compliance to type-approval requirements can be denoted by a third-party marking on the back of the product (e.g. UL, TUV, CSA), or by a Type-Approval certificate obtained by a manufacturer and kept on file.ype Approval is not a term confined to a particular industry. Type Approval requirements exist for products as diverse as marine equipment, mobile phones, automotive industry, or medical equipment. Type approval simply means that the product is certified to meet certain requirements for its type, whatever that may be.